Rear portion of an automobile



FIG. 1 is a top, side-perspective view of the rear portion of an automobile showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is left-side view thereof; and,

FIG. 5 is front view thereof. 

The ornamental design for the rear portion of an automobile, as shown and described. 